THE PURCHASE OF COAL UNDER SPECIFICATIONS. 27 
SOME PUBLICATIONS ON COAL. 
The following are a few of the Survey publications on coal. A 
more complete list is given in Bulletin No. 316, pages 518-532. The 
reports here named are now available for distribution. Others are in 
press and still others are in preparation. Applications for these 
reports, except for Bulletin No. 261 and Professional Paper No. 48, 
should be addressed to The Director, United States Geological 
Survey, Washington, D. C. 
Bulletin No. 261. Preliminary report on the operations of the coal-testing 
plant of the United States Geological Survey at the Louisiana Purchase Exposi- 
tion, St. Louis, Mo., 1904. E. W. Parker, J. A. Holmes, M. R. Campbell, com- 
mittee in charge. 1905. 172 pp. Out of stock. Can be obtained by sending 10 
cents in cash to the Superintendent of Documents, Washington, D. C. 
Professional Paper No. 48. Report on the operations of the coal-testing 
plant of the United States Geological Survey at the Louisiana Purchase Exposi- 
tion, St. Louis, Mo., 1904. E. W. Parker, J. A. Holmes, M. R. Campbell, com- 
mittee in charge. 1906. In three parts. 1492 pp., 13 pis. Out of stock. Can 
be obtained by sending $1.50 in cash to the Superintendent of Documents, 
Washington, D. C. 
Bulletin No. 290. Preliminary report on the operations of the fuel-testing 
plant of the United States Geological Survey at St. Louis, Mo., 1905. By J. A. 
Holmes. 1906. 240 pp. 
Bulletin No. 323. Experimental work conducted in the chemical laboratory 
of the fuel-testing plant, St. Louis, January 1, 1905, to July 31, 1906. By N. W. 
Lord. 1907. 49 pp. 
Bulletin No. 325. A study of four hundred steaming tests made at the fuel- 
testing plant, St. Louis, Mo., 1904, 1905, and 1906. By L. P. Breckenridge. 
1907. 196 pp. 
A few miscellaneous references of special interest may be given, 
as follows : 
Bement, A. The testing of coal. Western Society of P^ngineers. 
Electrical World. Editorial, April 6, 1907. 
Engineering Record. Editorial, April 13, 1907. 
Parr, S. W. Composition and character of coals. Bulletin No. 3, Illinois 
Geological Survey, Urbana, 111. 
Preliminary report of committee on coal analysis. Journal of the American 
Chemical Society, vol. 20, 1898. 
Report of the committee on coal analysis. Journal of the American Chemical 
Society, vol. 21, 1899. 
Voorhees, S. S. Analysis of coal. American Society for Testing Materials, 
1907. 
Woodwell, J. E. The purchase of coal. American Society for Testing Mate- 
rials, 1907 ; Mines and Minerals, September, 1907. 
